The hepatocyte nuclear factor 3beta stimulates the transcription of the human insulin-like growth factor I gene in a direct and indirect manner.

The Journal of Biological Chemistry
L A NoltenJ S Sussenbach

Abstract

Promoter 1 (P1) of the human insulin-like growth factor I (IGF-I) gene is most active in adult liver. In this study we show that HNF-3beta, a member of the winged helix protein family of liver-enriched transcription factors, has a strong stimulatory effect on the activity of P1. Transient transfection experiments in combination with bandshift and DNase I footprinting analysis revealed the presence of two HNF-3 binding sites in the proximal promoter region of P1. Both binding sites, which are well conserved in evolution, are required for maximal transactivation. Studies employing HNF-3 mutant constructs indicated that IGF-I expression is also regulated indirectly by HNF-3beta as a consequence of enhanced expression of HNF-1alpha. This liver-enriched transcription factor has previously been shown to transactivate P1. Thus, HNF-3beta regulates the expression of the human IGF-I gene via two distinct mechanisms.

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